There was a news story a few years ago about a big chunk of ice coming through somebody's roof. But speaking of waste, an anecdote:

At the height of the Vietnam bombing, as an young one-bar air refueling navigator, we went TDY to provide required training hookups to 17th AF units at Gretchen Anchor. If all the fighters scheduled didn't show up after time on track, on the way back down to EDAF, we'd dump the remaining fuel starting at 18000 feet --100K lbs or more-- so as not to land with partially full tanks sloshing around. It was years later that I learned the term hydrocarbon emissions.